Science test Flashcards
Organism
living things
Cell
basic unit of structure and function in an organism
Unicellular
one cell Ex. bacteria
Multicellular
organisms that are composed of many cells
Ex. humans, mammals,and plants
Stimulus
a change in an organism’s surroundings that cause the organism to react
Response
an action or change in behavior
Spontaneous generation
mistaken idea that living things can arise from nonliving sources
Controlled experiment:
a scientist carries out two test that are identical in every respect except for one factor (manipulated variable)
Autotroph
Organisms that make their own food
Heterotroph
Organisms that cannot make their own food
Homeostasis
The maintenance of stable internal conditions
What are the six characteristics of living things?
The six characteristics of living things are reproduction, use of energy, response to surroundings, composed of chemicals, cellular organization, and growth and development
What are the four needs of living things?
The four needs of living things are water, shelter, food, and stable internal conditions
What two experiments prove that spontaneous generation does not exist?
Redis - covered/uncovered jars
Meat inside
Flies lay eggs on meat that is uncovered
No flies on covered jar
This proves maggots don’t come from nonliving meat
What is the difference between biotic and abiotic? What are examples?
Biotic - living things
Abiotic - nonliving things ex. rock
